In the work bowl of a food processor, combine olives, parsley, basil, capers, lemon zest, lemon juice, and garlic, pulsing until mixture is finely chopped and well blended.
Cover, and refrigerate tapenade until needed, up to a day.
Just before using, add olive oil, stirring to incorporate.
Recipe by TeaTime Magazine at https://teatimemagazine.com/2-smoked-salmon-cucumber-canapes-nicoise-olive-tapenade-recipe/